ETL - How you capture changes in data if the source system does not have option of storing date/time field

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How you capture changes in data if the source system does not have option of storing date/time field in source table from where you need to extract the data?

The DW database can be Oracle or Teradata. The requirement here is to pull data from source system and ETL need to device a mechanism to identify the changes or new records. The source system can be a legacy system like AS400 application or Mainframe application. List out all such methods of data capture. The ETL can be Informatica, data stage or custom etl code.

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Last Update: July 13, 2007 Asked by: GeekNo1

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